Update README.md

README.md

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----
-license: mit
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+---
+license: mit
+---
+@inproceedings{xie2021segformer,
+  title={SegFormer: Simple and Efficient Design for Semantic Segmentation with Transformers},
+  author={Xie, Enze and Wang, Wenhai and Yu, Zhiding and Anandkumar, Anima and Alvarez, Jose M and Luo, Ping},
+  booktitle={Neural Information Processing Systems (NeurIPS)},
+  year={2021}
+}